Zhongxing Xu | 12b49d9 | 2008-11-11 01:25:18 +0000 | [diff] [blame] | 1 | // RUN: clang -std=gnu99 -checker-simple -verify %s && |
Zhongxing Xu | fe81bc2 | 2008-11-10 09:43:12 +0000 | [diff] [blame] | 2 | // RUN: clang -std=gnu99 -checker-simple -analyzer-store-region -verify %s |
Ted Kremenek | 2f54af4 | 2008-04-02 16:54:39 +0000 | [diff] [blame] | 3 | |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 4 | #include<stdint.h> |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame] | 5 | #include <assert.h> |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 6 | |
Ted Kremenek | 2f54af4 | 2008-04-02 16:54:39 +0000 | [diff] [blame] | 7 | void f1(int *p) { |
8 | if (p) *p = 1; | ||||
9 | else *p = 0; // expected-warning{{ereference}} | ||||
10 | } | ||||
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 11 | |
12 | struct foo_struct { | ||||
13 | int x; | ||||
14 | }; | ||||
15 | |||||
16 | int f2(struct foo_struct* p) { | ||||
17 | |||||
18 | if (p) | ||||
19 | p->x = 1; | ||||
20 | |||||
Ted Kremenek | 3603d73 | 2008-04-21 23:45:26 +0000 | [diff] [blame] | 21 | return p->x++; // expected-warning{{Dereference of null pointer.}} |
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 22 | } |
Ted Kremenek | 9704eac | 2008-04-22 04:56:55 +0000 | [diff] [blame] | 23 | |
24 | int f3(char* x) { | ||||
25 | |||||
26 | int i = 2; | ||||
27 | |||||
28 | if (x) | ||||
29 | return x[i - 1]; | ||||
30 | |||||
31 | return x[i+1]; // expected-warning{{Dereference of null pointer.}} | ||||
32 | } | ||||
33 | |||||
Ted Kremenek | e2013f5 | 2008-04-29 23:25:09 +0000 | [diff] [blame] | 34 | int f3_b(char* x) { |
35 | |||||
36 | int i = 2; | ||||
37 | |||||
38 | if (x) | ||||
39 | return x[i - 1]; | ||||
40 | |||||
41 | return x[i+1]++; // expected-warning{{Dereference of null pointer.}} | ||||
42 | } | ||||
43 | |||||
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 44 | int f4(int *p) { |
45 | |||||
Daniel Dunbar | 4489fe1 | 2008-08-05 00:07:51 +0000 | [diff] [blame] | 46 | uintptr_t x = (uintptr_t) p; |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 47 | |
48 | if (x) | ||||
49 | return 1; | ||||
50 | |||||
51 | int *q = (int*) x; | ||||
52 | return *q; // expected-warning{{Dereference of null pointer.}} | ||||
Ted Kremenek | a548846 | 2008-04-22 21:39:21 +0000 | [diff] [blame] | 53 | } |
54 | |||||
55 | int f5() { | ||||
56 | |||||
57 | char *s = "hello world"; | ||||
58 | return s[0]; // no-warning | ||||
59 | } | ||||
60 | |||||
Ted Kremenek | 7fb43c1 | 2008-09-01 19:57:52 +0000 | [diff] [blame] | 61 | int bar(int* p, int q) __attribute__((nonnull)); |
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 62 | |
63 | int f6(int *p) { | ||||
Ted Kremenek | 7fb43c1 | 2008-09-01 19:57:52 +0000 | [diff] [blame] | 64 | return !p ? bar(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}} |
65 | : bar(p, 0); // no-warning | ||||
66 | } | ||||
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 67 | |
Ted Kremenek | 22bda88 | 2008-07-31 20:31:27 +0000 | [diff] [blame] | 68 | int* qux(); |
69 | |||||
70 | int f7(int x) { | ||||
71 | |||||
72 | int* p = 0; | ||||
73 | |||||
74 | if (0 == x) | ||||
75 | p = qux(); | ||||
76 | |||||
77 | if (0 == x) | ||||
78 | *p = 1; // no-warning | ||||
79 | |||||
80 | return x; | ||||
81 | } | ||||
82 | |||||
Ted Kremenek | dd463b8 | 2008-08-16 00:45:40 +0000 | [diff] [blame] | 83 | int f8(int *p, int *q) { |
84 | if (!p) | ||||
85 | if (p) | ||||
86 | *p = 1; // no-warning | ||||
87 | |||||
88 | if (q) | ||||
89 | if (!q) | ||||
90 | *q = 1; // no-warning | ||||
91 | } | ||||
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame] | 92 | |
93 | int* qux(); | ||||
94 | |||||
Ted Kremenek | 0a41e5a | 2008-09-19 18:00:36 +0000 | [diff] [blame] | 95 | int f9(unsigned len) { |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame] | 96 | assert (len != 0); |
97 | int *p = 0; | ||||
Ted Kremenek | cafd908 | 2008-09-24 06:40:03 +0000 | [diff] [blame] | 98 | unsigned i; |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame] | 99 | |
Ted Kremenek | cafd908 | 2008-09-24 06:40:03 +0000 | [diff] [blame] | 100 | for (i = 0; i < len; ++i) |
Ted Kremenek | e2b0083 | 2008-09-16 23:25:28 +0000 | [diff] [blame] | 101 | p = qux(i); |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame] | 102 | |
103 | return *p++; // no-warning | ||||
104 | } | ||||
Ted Kremenek | f6e5ec4 | 2008-09-17 22:24:13 +0000 | [diff] [blame] | 105 | |
Ted Kremenek | 0a41e5a | 2008-09-19 18:00:36 +0000 | [diff] [blame] | 106 | int f9b(unsigned len) { |
Ted Kremenek | f6e5ec4 | 2008-09-17 22:24:13 +0000 | [diff] [blame] | 107 | assert (len > 0); // note use of '>' |
108 | int *p = 0; | ||||
Ted Kremenek | cafd908 | 2008-09-24 06:40:03 +0000 | [diff] [blame] | 109 | unsigned i; |
Ted Kremenek | f6e5ec4 | 2008-09-17 22:24:13 +0000 | [diff] [blame] | 110 | |
Ted Kremenek | cafd908 | 2008-09-24 06:40:03 +0000 | [diff] [blame] | 111 | for (i = 0; i < len; ++i) |
Ted Kremenek | f6e5ec4 | 2008-09-17 22:24:13 +0000 | [diff] [blame] | 112 | p = qux(i); |
113 | |||||
114 | return *p++; // no-warning | ||||
115 | } | ||||
116 | |||||
Ted Kremenek | 973e72a | 2008-11-15 04:44:13 +0000 | [diff] [blame] | 117 | int* f10(int* p, signed char x, int y) { |
118 | // This line tests symbolication with compound assignments where the | ||||
119 | // LHS and RHS have different bitwidths. The new symbolic value | ||||
120 | // for 'x' should have a bitwidth of 8. | ||||
121 | x &= y; | ||||
122 | |||||
123 | // This tests that our symbolication worked, and that we correctly test | ||||
124 | // x against 0 (with the same bitwidth). | ||||
125 | if (!x) { | ||||
126 | if (!p) return; | ||||
127 | *p = 10; | ||||
128 | } | ||||
129 | else p = 0; | ||||
130 | |||||
131 | if (!x) | ||||
132 | *p = 5; // no-warning | ||||
133 | |||||
134 | return p; | ||||
135 | } | ||||
136 | |||||
Ted Kremenek | 73abd13 | 2008-12-03 18:56:12 +0000 | [diff] [blame] | 137 | // Test case from <rdar://problem/6407949> |
138 | void f11(unsigned i) { | ||||
139 | int *x = 0; | ||||
140 | if (i >= 0) { | ||||
141 | // always true | ||||
142 | } else { | ||||
143 | *x = 42; // no-warning | ||||
144 | } | ||||
145 | } | ||||
146 | |||||
Ted Kremenek | d7ff487 | 2008-12-03 19:06:30 +0000 | [diff] [blame^] | 147 | void f11b(unsigned i) { |
148 | int *x = 0; | ||||
149 | if (i <= ~(unsigned)0) { | ||||
150 | // always true | ||||
151 | } else { | ||||
152 | *x = 42; // no-warning | ||||
153 | } | ||||
154 | } | ||||
155 |